center MessageBox in parent form

Question

Is there a easy way to center MessageBox in parent form in  net 2 0

User · Answer

Surely using your own panel or form would be by far the simplest approach if a little more heavy on the background  designer  code  It gives all the control in terms of centring and manipulation without writing all that custom code

User · Answer

But why stop with MessageBox-specific implementation  Use the class below like this       private void OnFormClosing object sender  FormClosingEventArgs e                DialogResult dg          using  DialogCenteringService centeringService   new DialogCenteringService this      center message box                       dg   MessageBox Show this   Are you sure     Confirm exit   MessageBoxButtons YesNo  MessageBoxIcon Question                      if  dg    DialogResult No                        e Cancel   true                    The code that you can use with anything that shows dialog windows  even if they re owned by another thread  our app has multiple UI threads     Here is the updated code which takes monitor working areas into account  so that the dialog isn t centered between two monitors or is partly off-screen  With it you ll need enum SetWindowPosFlags  which is below   public class DialogCenteringService   IDisposable       private readonly IWin32Window owner      private readonly HookProc hookProc      private readonly IntPtr hHook   IntPtr Zero       public DialogCenteringService IWin32Window owner                if  owner    null  throw new ArgumentNullException  owner             this owner   owner          hookProc   DialogHookProc           hHook   SetWindowsHookEx WH CALLWNDPROCRET  hookProc  IntPtr Zero  GetCurrentThreadId                private IntPtr DialogHookProc int nCode  IntPtr wParam  IntPtr lParam                if  nCode  lt  0                        return CallNextHookEx hHook  nCode  wParam  lParam                      CWPRETSTRUCT msg    CWPRETSTRUCT Marshal PtrToStructure lParam  typeof CWPRETSTRUCT            IntPtr hook   hHook           if  msg message     int CbtHookAction HCBT ACTIVATE                        try                               CenterWindow msg hwnd                             finally                               UnhookWindowsHookEx hHook                                    return CallNextHookEx hook  nCode  wParam  lParam              public void Dispose                 UnhookWindowsHookEx hHook              private void CenterWindow IntPtr hChildWnd                Rectangle recChild   new Rectangle 0  0  0  0           bool success   GetWindowRect hChildWnd  ref recChild            if   success                        return                     int width   recChild Width - recChild X          int height   recChild Height - recChild Y           Rectangle recParent   new Rectangle 0  0  0  0           success   GetWindowRect owner Handle  ref recParent            if   success                        return                     Point ptCenter   new Point 0  0           ptCenter X   recParent X     recParent Width - recParent X    2           ptCenter Y   recParent Y     recParent Height - recParent Y    2             Point ptStart   new Point 0  0           ptStart X    ptCenter X -  width   2            ptStart Y    ptCenter Y -  height   2               MoveWindow hChildWnd  ptStart X  ptStart Y  width  height  false           Task Factory StartNew      gt  SetWindowPos hChildWnd   IntPtr 0  ptStart X  ptStart Y  width  height  SetWindowPosFlags SWP ASYNCWINDOWPOS   SetWindowPosFlags SWP NOSIZE   SetWindowPosFlags SWP NOACTIVATE   SetWindowPosFlags SWP NOOWNERZORDER   SetWindowPosFlags SWP NOZORDER                  some p invoke         ReSharper disable InconsistentNaming     public delegate IntPtr HookProc int nCode  IntPtr wParam  IntPtr lParam        public delegate void TimerProc IntPtr hWnd  uint uMsg  UIntPtr nIDEvent  uint dwTime        private const int WH CALLWNDPROCRET   12          ReSharper disable EnumUnderlyingTypeIsInt     private enum CbtHookAction   int        ReSharper restore EnumUnderlyingTypeIsInt                  ReSharper disable UnusedMember Local         HCBT MOVESIZE   0          HCBT MINMAX   1          HCBT QS   2          HCBT CREATEWND   3          HCBT DESTROYWND   4          HCBT ACTIVATE   5          HCBT CLICKSKIPPED   6          HCBT KEYSKIPPED   7          HCBT SYSCOMMAND   8          HCBT SETFOCUS   9            ReSharper restore UnusedMember Local             DllImport  kernel32 dll        static extern int GetCurrentThreadId          DllImport  user32 dll        private static extern bool GetWindowRect IntPtr hWnd  ref Rectangle lpRect         DllImport  user32 dll        private static extern int MoveWindow IntPtr hWnd  int X  int Y  int nWidth  int nHeight  bool bRepaint         DllImport  user32 dll         return  MarshalAs UnmanagedType Bool       private static extern bool SetWindowPos IntPtr hWnd  IntPtr hWndInsertAfter  int x  int y  int cx  int cy  SetWindowPosFlags uFlags         DllImport  User32 dll        public static extern UIntPtr SetTimer IntPtr hWnd  UIntPtr nIDEvent  uint uElapse  TimerProc lpTimerFunc         DllImport  User32 dll        public static extern IntPtr SendMessage IntPtr hWnd  int Msg  IntPtr wParam  IntPtr lParam         DllImport  user32 dll        public static extern IntPtr SetWindowsHookEx int idHook  HookProc lpfn  IntPtr hInstance  int threadId         DllImport  user32 dll        public static extern int UnhookWindowsHookEx IntPtr idHook         DllImport  user32 dll        public static extern IntPtr CallNextHookEx IntPtr idHook  int nCode  IntPtr wParam  IntPtr lParam         DllImport  user32 dll        public static extern int GetWindowTextLength IntPtr hWnd         DllImport  user32 dll        public static extern int GetWindowText IntPtr hWnd  StringBuilder text  int maxLength         DllImport  user32 dll        public static extern int EndDialog IntPtr hDlg  IntPtr nResult         StructLayout LayoutKind Sequential       public struct CWPRETSTRUCT               public IntPtr lResult          public IntPtr lParam          public IntPtr wParam          public uint message          public IntPtr hwnd                ReSharper restore InconsistentNaming     Flags  public enum SetWindowPosFlags   uint          ReSharper disable InconsistentNaming           lt summary gt              If the calling thread and the thread that owns the window are attached to different input queues  the system posts the request to the thread that owns the window  This prevents the calling thread from blocking its execution while other threads process the request           lt  summary gt      SWP ASYNCWINDOWPOS   0x4000            lt summary gt              Prevents generation of the WM SYNCPAINT message           lt  summary gt      SWP DEFERERASE   0x2000            lt summary gt              Draws a frame  defined in the window s class description  around the window           lt  summary gt      SWP DRAWFRAME   0x0020            lt summary gt              Applies new frame styles set using the SetWindowLong function  Sends a WM NCCALCSIZE message to the window  even if the window s size is not being changed  If this flag is not specified  WM NCCALCSIZE is sent only when the window s size is being changed           lt  summary gt      SWP FRAMECHANGED   0x0020            lt summary gt              Hides the window           lt  summary gt      SWP HIDEWINDOW   0x0080            lt summary gt              Does not activate the window  If this flag is not set  the window is activated and moved to the top of either the topmost or non-topmost group  depending on the setting of the hWndInsertAfter parameter            lt  summary gt      SWP NOACTIVATE   0x0010            lt summary gt              Discards the entire contents of the client area  If this flag is not specified  the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned           lt  summary gt      SWP NOCOPYBITS   0x0100            lt summary gt              Retains the current position  ignores X and Y parameters            lt  summary gt      SWP NOMOVE   0x0002            lt summary gt              Does not change the owner window s position in the Z order           lt  summary gt      SWP NOOWNERZORDER   0x0200            lt summary gt              Does not redraw changes  If this flag is set  no repainting of any kind occurs  This applies to the client area  the nonclient area  including the title bar and scroll bars   and any part of the parent window uncovered as a result of the window being moved  When this flag is set  the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing           lt  summary gt      SWP NOREDRAW   0x0008            lt summary gt              Same as the SWP NOOWNERZORDER flag           lt  summary gt      SWP NOREPOSITION   0x0200            lt summary gt              Prevents the window from receiving the WM WINDOWPOSCHANGING message           lt  summary gt      SWP NOSENDCHANGING   0x0400            lt summary gt              Retains the current size  ignores the cx and cy parameters            lt  summary gt      SWP NOSIZE   0x0001            lt summary gt              Retains the current Z order  ignores the hWndInsertAfter parameter            lt  summary gt      SWP NOZORDER   0x0004            lt summary gt              Displays the window           lt  summary gt      SWP SHOWWINDOW   0x0040          ReSharper restore InconsistentNaming

User · Answer

I have changed a little bit previous answer and compose WPF version of the MessageBoxEx  This code works for me great  Feel free to notify about issues of the code   Please note  I use GeneralObjects MainWindowInstance at ctor to initialize class with my main window  but actually I use it for any window due to some kind of cache for last parent window  Therefore you can simple remove out everything from ctor   public class MessageBoxEx       private static HwndSource source    null      private static HwndSourceHook hook    null       static MessageBoxEx                 try                          create cached              createHwndSource  GeneralObjects MainWindowInstance                hook    new HwndSourceHook HwndSourceHook                     finally                       if  null    source                     null    hook                                 source    null                  hook    null                                       private static void createHwndSource  Window owner                source     HwndSource PresentationSource FromVisual owner              public static void Initialize  Window owner   null                try                       if  null    owner                                if source  RootVisual    owner                                        createHwndSource  owner                                                      finally                       if  null    source                     null    hook                                 source    null                  hook    null                                    if  null    source   amp  amp              null    hook                         source  AddHook hook                          public static MessageBoxResult Show string messageBoxText                Initialize             return System Windows MessageBox Show messageBoxText               public static MessageBoxResult Show string messageBoxText  string caption                Initialize             return System Windows MessageBox Show messageBoxText  caption               public static MessageBoxResult Show Window owner  string messageBoxText                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText               public static MessageBoxResult Show string messageBoxText  string caption  MessageBoxButton button                Initialize             return System Windows MessageBox Show messageBoxText  caption  button               public static MessageBoxResult Show Window owner  string messageBoxText  string caption                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText  caption               public static MessageBoxResult Show string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon                Initialize             return System Windows MessageBox Show messageBoxText  caption  button  icon               public static MessageBoxResult Show Window owner  string messageBoxText  string caption  MessageBoxButton button                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText  caption  button               public static MessageBoxResult Show string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon  MessageBoxResult defaultResult                Initialize             return System Windows MessageBox Show messageBoxText  caption  button  icon  defaultResult               public static MessageBoxResult Show Window owner  string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText  caption  button  icon               public static MessageBoxResult Show string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon  MessageBoxResult defaultResult  System Windows MessageBoxOptions options                Initialize             return System Windows MessageBox Show messageBoxText  caption  button  icon  defaultResult  options               public static MessageBoxResult Show Window owner  string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon  MessageBoxResult defaultResult                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText  caption  button  icon  defaultResult               public static MessageBoxResult Show Window owner  string messageBoxText  string caption  MessageBoxButton button  MessageBoxImage icon  MessageBoxResult defaultResult  System Windows MessageBoxOptions options                Initialize  owner           return System Windows MessageBox Show owner  messageBoxText  caption  button  icon  defaultResult  options              private enum WM   int               WM ACTIVATE   0x0006            private static IntPtr HwndSourceHook IntPtr hwnd  int msg  IntPtr wParam  IntPtr lParam  ref bool handled                 if   int WM WM ACTIVATE    msg  amp  amp              source  Handle    hwnd  amp  amp              0     int wParam                         try                               CenterWindow lParam                             finally                                  remove hook at once after moved message box window                  source  RemoveHook hook                                    return IntPtr Zero              DllImport  user32 dll        private static extern bool GetWindowRect IntPtr hWnd  ref Rectangle lpRect          DllImport  user32 dll        private static extern int MoveWindow IntPtr hWnd  int X  int Y  int nWidth  int nHeight  bool bRepaint        private static void CenterWindow IntPtr hChildWnd                System Drawing Rectangle recChild   new System Drawing Rectangle 0  0  0  0            bool success   GetWindowRect hChildWnd  ref recChild            int width   recChild Width - recChild X          int height   recChild Height - recChild Y           System Drawing Rectangle recParent   new System Drawing Rectangle 0  0  0  0           success   GetWindowRect source  Handle  ref recParent            System Drawing Point ptCenter   new System Drawing Point 0  0           ptCenter X   recParent X     recParent Width - recParent X    2           ptCenter Y   recParent Y     recParent Height - recParent Y    2             System Drawing Point ptStart   new System Drawing Point 0  0           ptStart X    ptCenter X -  width   2            ptStart Y    ptCenter Y -  height   2                I have commented this code because of I have 2 monitors            so If application located at 1st monitor            message box can appear at second one                      ptStart X    ptStart X  lt  0    0   ptStart X          ptStart Y    ptStart Y  lt  0    0   ptStart Y                      int result   MoveWindow hChildWnd  ptStart X  ptStart Y  width                                  height  false

User · Answer

Try this  it s simple enough to justify the time     This is for Win32 API  written in C  Translate it as you need     case WM NOTIFY     HWND X FindWindow   32770  NULL     if GetParent X   H frame  int Px Py Sx Sy  RECT R1 R2      GetWindowRect hwnd  amp R1   GetWindowRect X  amp R2       Sx R2 right-R2 left Px R1 left  R1 right-R1 left  2-Sx 2      Sy R2 bottom-R2 top Py R1 top  R1 bottom-R1 top  2-Sy 2      MoveWindow X Px Py Sx Sy 1         break    Add that to the WndProc code    You can set position as you like  in this case it just centres over the main program window  It will do this for any messagebox  or file open save dialog  and likely some other native controls  I m not sure  but I think you may need to include COMMCTRL or COMMDLG to use this  at least  you will if you want open save dialogs   I experimented with looking at the notify codes and hwndFrom of NMHDR  then decided it was just as effective  and far easier  not to  If you really want to be very specific  tell FindWindow to look for a unique caption  title  you give to the window you want it to find   This fires before the messagebox is drawn onscreen  so if you set a global flag to indicate when action is done by your code  and look for a unique caption  you be sure that actions you take will only occur once  there will likely be multiple notifiers   I haven t explored this in detail  but I managed get CreateWindow to put an edit box on a messagebox dialog  It looked as out of place as a rat s ear grafted onto the spine of a cloned pig  but it works  Doing things this way may be far easier than having to roll your own   Crow   EDIT  Small correction to make sure that the right window is handled  Make sure that parent handles agree throughout  and this should work ok  It does for me  even with two instances of the same program

User · Answer

From a comment on Joel Spolsky s blog   A Messagebox is always centered on the screen  You can provide an owner  but that is just for Z-order  not centering  The only way is to use Win32 hooks and center it yourself  You can find code doing that online if you search for it  Much easier is to just write your own message box class and add centering functionality  Then you can also add default captioning  Do not show again-checkbox and making them modeless    quot Win32 hooks quot  probably refers to using SetWindowsHookEx as shown in this example

User · Answer

I really needed this in C  and found Center MessageBox C   Here s a nicely formatted version  using System  using System Windows Forms  using System Text  using System Drawing  using System Runtime InteropServices      public class MessageBoxEx       private static IWin32Window  owner      private static HookProc  hookProc      private static IntPtr  hHook       public static DialogResult Show string text                Initialize            return MessageBox Show text              public static DialogResult Show string text  string caption                Initialize            return MessageBox Show text  caption              public static DialogResult Show string text  string caption  MessageBoxButtons buttons                Initialize            return MessageBox Show text  caption  buttons              public static DialogResult Show string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon                Initialize            return MessageBox Show text  caption  buttons  icon              public static DialogResult Show string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon  MessageBoxDefaultButton defButton                Initialize            return MessageBox Show text  caption  buttons  icon  defButton              public static DialogResult Show string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon  MessageBoxDefaultButton defButton  MessageBoxOptions options                Initialize            return MessageBox Show text  caption  buttons  icon  defButton  options              public static DialogResult Show IWin32Window owner  string text                 owner   owner          Initialize            return MessageBox Show owner  text              public static DialogResult Show IWin32Window owner  string text  string caption                 owner   owner          Initialize            return MessageBox Show owner  text  caption              public static DialogResult Show IWin32Window owner  string text  string caption  MessageBoxButtons buttons                 owner   owner          Initialize            return MessageBox Show owner  text  caption  buttons              public static DialogResult Show IWin32Window owner  string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon                 owner   owner          Initialize            return MessageBox Show owner  text  caption  buttons  icon              public static DialogResult Show IWin32Window owner  string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon  MessageBoxDefaultButton defButton                 owner   owner          Initialize            return MessageBox Show owner  text  caption  buttons  icon  defButton              public static DialogResult Show IWin32Window owner  string text  string caption  MessageBoxButtons buttons  MessageBoxIcon icon  MessageBoxDefaultButton defButton  MessageBoxOptions options                 owner   owner          Initialize            return MessageBox Show owner  text  caption  buttons  icon                                 defButton  options              public delegate IntPtr HookProc int nCode  IntPtr wParam  IntPtr lParam        public delegate void TimerProc IntPtr hWnd  uint uMsg  UIntPtr nIDEvent  uint dwTime        public const int WH CALLWNDPROCRET   12       public enum CbtHookAction   int               HCBT MOVESIZE   0          HCBT MINMAX   1          HCBT QS   2          HCBT CREATEWND   3          HCBT DESTROYWND   4          HCBT ACTIVATE   5          HCBT CLICKSKIPPED   6          HCBT KEYSKIPPED   7          HCBT SYSCOMMAND   8          HCBT SETFOCUS   9             DllImport  user32 dll        private static extern bool GetWindowRect IntPtr hWnd  ref Rectangle lpRect         DllImport  user32 dll        private static extern int MoveWindow IntPtr hWnd  int X  int Y  int nWidth  int nHeight  bool bRepaint         DllImport  User32 dll        public static extern UIntPtr SetTimer IntPtr hWnd  UIntPtr nIDEvent  uint uElapse  TimerProc lpTimerFunc         DllImport  User32 dll        public static extern IntPtr SendMessage IntPtr hWnd  int Msg  IntPtr wParam  IntPtr lParam         DllImport  user32 dll        public static extern IntPtr SetWindowsHookEx int idHook  HookProc lpfn  IntPtr hInstance  int threadId         DllImport  user32 dll        public static extern int UnhookWindowsHookEx IntPtr idHook         DllImport  user32 dll        public static extern IntPtr CallNextHookEx IntPtr idHook  int nCode  IntPtr wParam  IntPtr lParam         DllImport  user32 dll        public static extern int GetWindowTextLength IntPtr hWnd         DllImport  user32 dll        public static extern int GetWindowText IntPtr hWnd  StringBuilder text  int maxLength         DllImport  user32 dll        public static extern int EndDialog IntPtr hDlg  IntPtr nResult         StructLayout LayoutKind Sequential       public struct CWPRETSTRUCT               public IntPtr lResult          public IntPtr lParam          public IntPtr wParam          public uint message          public IntPtr hwnd               static MessageBoxEx                  hookProc   new HookProc MessageBoxHookProc            hHook   IntPtr Zero             private static void Initialize                 if   hHook    IntPtr Zero                        throw new NotSupportedException  multiple calls are not supported                       if   owner    null                         hHook   SetWindowsHookEx WH CALLWNDPROCRET   hookProc  IntPtr Zero  AppDomain GetCurrentThreadId                          private static IntPtr MessageBoxHookProc int nCode  IntPtr wParam  IntPtr lParam                if  nCode  lt  0                        return CallNextHookEx  hHook  nCode  wParam  lParam                      CWPRETSTRUCT msg    CWPRETSTRUCT Marshal PtrToStructure lParam  typeof CWPRETSTRUCT            IntPtr hook    hHook           if  msg message     int CbtHookAction HCBT ACTIVATE                        try                               CenterWindow msg hwnd                             finally                               UnhookWindowsHookEx  hHook                    hHook   IntPtr Zero                                   return CallNextHookEx hook  nCode  wParam  lParam              private static void CenterWindow IntPtr hChildWnd                Rectangle recChild   new Rectangle 0  0  0  0           bool success   GetWindowRect hChildWnd  ref recChild            int width   recChild Width - recChild X          int height   recChild Height - recChild Y           Rectangle recParent   new Rectangle 0  0  0  0           success   GetWindowRect  owner Handle  ref recParent            Point ptCenter   new Point 0  0           ptCenter X   recParent X     recParent Width - recParent X    2           ptCenter Y   recParent Y     recParent Height - recParent Y    2             Point ptStart   new Point 0  0           ptStart X    ptCenter X -  width   2            ptStart Y    ptCenter Y -  height   2             ptStart X    ptStart X  lt  0    0   ptStart X          ptStart Y    ptStart Y  lt  0    0   ptStart Y           int result   MoveWindow hChildWnd  ptStart X  ptStart Y  width                                  height  false

[c#] center MessageBox in parent form

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